The application of magnetic fluids in sealing nodes designed for operation in difficult conditions and in machines used in sea environment

• Autorzy: Matuszewski L. , Szydło Z.
• Języki publikacji: EN

Abstrakty

EN

Presented in article MF seals are being researched for sea technology purposes due to their excellent tightness and low resistance of motion. These features are most valuable for ring propellers and ship’s main propeller shaft. There are more reasons why technologists payf significant attention for various MF seals applications in their difficult operating conditions. For instance, an advanced pumping systems are designed with contactless (screw or centrifugal) fluid seal used as the first stage seal and then the MF seal as the main seal. Further parts of the article contain discuss of the properties of magnetic fluids in the construction of MF seals. Sample of the few systems of magnetic fluid seals are presented, which have been researched lately in our laboratory including sea conditions. The magnetic fluids used in our seals are colloidal suspensions of magnetic nanoparticles. Undertaken earlier various systems selection for sea-water purposes forced us to focus on double sealing systems, in which the MF seal is used as the second seal following a conventional system especially adapted to co-operation with MF systems. This solution successfully limits direct contact of the sealed liquid with the magnetic fluid, and the entire sealing construction secures absolute tightness of the system. Using this solution we also can reduce costs by elements high accuracy avoidance. Research and design activities are carried out in the AGH Laboratory of Seals and Magnetic Fluid Applications together with Deep Water Department of Technical University of Gdansk over the use of magnetic fluid seals in sea water environment. These activities are oriented on working out MF seals able to work effectively in machines in which low-pressure water flow takes place. The objects of experimental investigations are seals having two different nominal diameters: 50 mm and 220 mm and two research rigs of different construction had to be built up. Works are scheduled to be continued.

Słowa kluczowe

EN

FM seal; sealing; magnetic fluids; sea technology; propellers

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2008
• Tom: nr 3
• Strony: 49--58
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Matuszewski L.

autor

Szydło Z.

• AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Al. Mickiewicza 30 31-069 Kraków, POLAND,

Bibliografia

• 1. Berkovsky B.M., Medvedev V.F., Krakov M.S.: Magnetic fluids - engineering applications, Oxford Science Publications, 1993
• 2. Rosensweig R.E.: Ferrohydrodynamics, Cambridge University Press, Cambridge, MA, 1985
• 3. Orlov D.W., Podgorkov W.S.: Magnitnyje żidkosti w maszinostrojenii, Izd. Maszinostrojenije, Moskwa, 1993
• 4. Kamiyama S., Oyama T., Htwe J. : Basic study on the performance of magnetic fluid seals, pp. 985–990. Proc. of JSLE Int Tribology Conf. 1985
• 5. J. Kurfess, H.K. Müller : Sealing liquids with magnetic fluids, Journal of Magnetism and Magnetic Materials, 85, 1990
• 6. Ławniczak A., Milecki A.: Electro- and magnetorheological fluids and their technical applications, Publishing House of Poznan University of Technology, Poznań, 1999 (in Polish)
• 7. Catalogue: Ferrofluid-based seals, Ferrolabs Inc. (Rosja)
• 8. Product Bulletin: Magneto-Rheological Fluids, LORD Corp. (USA)
• 9. Tietze W.: Handbuch Dichtungspraxis, 3.Auflage, Vulkan- Verlag, Essen 2003
• 10. USA patent, Int.Cl. F16J15/40, no 4681328, Magnetic fluid shaft seal
• 11. USA patent, Int.Cl. F 16J15/42, no 4054293, Hybrid magnetic fluid shaft seal
• 12. USA patent, Int.Cl. F16J15/54, no 4436313, Device for sealing a propeller shaft against invasion of sea water
• 13. JP patent, Int.Cl. F16J15/16, no 62178498, Stern pipe sealing device